\documentclass{article}
% translate with >> pdflatex -shell-escape <file>

% This file is used as unit test for pgfplots, copyright by Christian Feuersaenger.
% 
% See
%   http://pgfplots.sourceforge.net/pgfplots.pdf
% for pgfplots.
%
% Any required input files (for <plot table> or <plot file> or the table package) can be downloaded
% at
% http://www.ctan.org/tex-archive/graphics/pgf/contrib/pgfplots/doc/latex/
% and
% http://www.ctan.org/tex-archive/graphics/pgf/contrib/pgfplots/doc/latex/plotdata/

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\pagestyle{empty}

\usepgfplotslibrary{ternary}

\begin{document}

\begin{tikzpicture}
%\tracingmacros=2 \tracingcommands=2
	\begin{ternaryaxis}[
		footnotesize,
		extra y ticks=0.44,
	]

	\addplot3+[scatter] coordinates {
		(1,0,0)
		(0,1,0)
		(0,0,1)
		(1,0,1)
		(0,0.5,0.5)
		(0.5,0.5,0)
		(0.5,0,0.5)
		(0.33333,0.33333,0.33333)
	};
	\end{ternaryaxis}
\end{tikzpicture}
\end{document}
